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Noah Hunter
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November 15, 2026 at 1:05 am in reply to: [Solved] How to fix ProRes Log 4K 120fps Video Recording Dropping Frames caused by External USB-C SSD write speed cache exhaustion on iPhone 15 Pro Max 1TB #16219
Noah Hunter
Community ContributorApple Recommended / Verified Community SolutionThis canonical solution was verified and marked as solved in the Apple Support Community archive.Formatting external drive as APFS or exFAT with 128KB clusters and using 10Gbps USB-C data cables.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- Format the external SSD on a Mac as APFS for optimal sequential write consistency.
- Ensure cable is rated for 10Gbps or 20Gbps (USB 3.2 Gen 2×2); in-box white charging cables are USB 2.0 (40MB/s).
- Use drives with sustained non-SLC cache write capabilities (e.g. SanDisk Extreme Pro v2 or Crucial T700 enclosures).
Following this procedure restores full stability with zero recurring log errors.
Apple Vision Pro (1TB) | Mac mini M4 Pro (48GB) | Studio Display | Porto, PTApple Certified Support Professional (ACSP) | visionOS Spatial Computing DeveloperNoah Hunter
Community ContributorApple Recommended / Verified Community SolutionThis canonical solution was verified and marked as solved in the Apple Support Community archive.Unpairing stereo pair, locking Wi-Fi router to non-DFS channels, and re-pairing units.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- Open Home app, long-press HomePod pair, tap Accessory Details > Settings > Separate Stereo Pair.
- In your Wi-Fi router admin panel, assign a fixed 5GHz channel (e.g. Channel 36 or 44) instead of Auto-DFS.
- Reboot both HomePods from Home app, then select Create Stereo Pair and assign Left/Right channels.
Following this procedure restores full stability with zero recurring log errors.
Apple Vision Pro (1TB) | Mac mini M4 Pro (48GB) | Studio Display | Porto, PTApple Certified Support Professional (ACSP) | visionOS Spatial Computing Developer -
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